臺灣博碩士論文加值系統

　　地理資訊系統（GIS）在軍事或民間應用領域中已被視為重要的工具。由於傳統資料庫的地理資料缺乏整體性。因此本研究以Gargantini線性四元樹編碼法為基礎，結合物件導向觀念來發展地理資訊系統，並使用Dorado資料庫管理系統作為發展平台。
　　Gargantini線性四元樹編碼法具有易於開發與製作的優點。而以物件導向觀念來開發軟體系統則是一種極有效率的方式。本研究提出以兩層式物件導向模式（Two-Level Object-Oriented Model, TLOOM）將網格地理資訊系統結合物件導向資料庫（OODB），將地理資料存入物件導向資料庫中以利於存取。根據物件導向觀念中類別（Class）的定義，將網格影像分類存成不同的類別，而原先隱含於線性四元樹碼中資料的關係，則轉換成物件的屬性（Attribute）。
　　最後透過系統實作，以資料查詢與進行各項基本運算的方式，來驗證其可性性。

　　Geographical information system (GIS) has already been considered as an important tool in military or civilian applications. Less integration and disagreement with the real world are the relational database's shortages. The objective of this research is to develop a GIS based on the Gargantini's linear quadtree coding scheme with the object-oriented (OO) analysis and design concept. The Dorado, an object-oriented database management system (OODBMS), is applied to implement the proposed GIS.
　　The Gargantini's linear quadtree coding scheme has advantages of simple algorithm and easy implementation. Object-oriented design and analysis is a useful methodlogy to develop software systems. The proposed raster-based GIS using Two-Level Object-Oriented Model is a new method to demonstrate the feasibility of this research direction. Information in a raster-based map can be classified into many blocks and layers, every block and layer is viewed as a object. The characteristics and relationship among spatial data implied in quaternary codes are transformed into the attributes of objects.
　　According to the implementation of the prototype system, using information query and every kind of basic operations to test and verify its feasibility.